SBLOC — Securities-Backed Line of Credit
Access liquidity from your investment portfolio without selling — avoiding capital gains tax while keeping your assets fully invested and growing.
A Securities-Backed Line of Credit (SBLOC) — also called a Pledged Asset Line or margin loan — allows you to borrow against the market value of your investment portfolio without selling any positions. You pledge your portfolio as collateral and receive a credit line typically equal to 50–70% of the portfolio's value. The interest rate is generally competitive with mortgage rates.
The critical tax advantage: borrowing is not a taxable event. You receive $1 million of purchasing power through an SBLOC with zero tax. You receive $1 million by selling appreciated securities and pay 23.8% capital gains tax — leaving you with $762,000. The SBLOC gives you the full $1 million while your portfolio stays invested and continues compounding.
This is the "Borrow" component of the Buy-Borrow-Die strategy — used to access liquidity for real estate down payments, business investments, living expenses, charitable gifts, or any other purpose without triggering the capital gains tax that a portfolio sale would create.
If your portfolio declines significantly, the lender may reduce your available credit or require you to repay a portion of the loan — a "margin call." In a serious market downturn, you may be forced to sell securities at market lows to meet the call, crystallizing the capital gains you sought to avoid at exactly the wrong time. Managing this risk requires maintaining substantial cushion above the loan balance — we recommend borrowing no more than 30–40% of your portfolio's value, even if the lender would allow more.
Illustrative only. Figures assume a 23.8% combined federal capital gains and net investment income tax rate and a proportionate allocation of basis. State tax and transaction costs are not modeled. Interest shown is first-year simple interest — borrowing costs compound and rates can change. Loan proceeds must be repaid, and a decline in portfolio value can trigger a collateral call requiring sales at unfavorable prices. Borrowing defers rather than eliminates tax; outcomes depend on basis, holding period, state law, and individual circumstances. Requires individualized tax, legal, investment, and lending review.
- Borrowing is not a taxable event — SBLOC proceeds are not income and generate no tax liability regardless of the amount borrowed or the purpose of the loan.
- Portfolio stays fully invested — assets continue compounding during the period the loan is outstanding, so you earn investment returns on assets you would have sold.
- Investment interest deduction — if SBLOC proceeds are used to purchase other investments, the interest may be deductible against investment income under §163(d).
- Step-up eliminates the deferred gain — if the appreciated positions are held until death, the step-up in basis may eliminate the capital gains that would have been recognized in a sale.
- Margin call risk — portfolio declines can trigger forced sales at market lows, crystallizing gains under the worst possible conditions. Maintain significant loan-to-value cushion.
- Interest cost — while typically lower than the capital gains tax avoided, interest compounds and must be paid or capitalized. Rising interest rate environments increase the cost of carry.
- Personal consumption interest is not deductible — interest on SBLOC proceeds used for personal expenses (vacations, cars, living expenses) is nondeductible consumer interest. Only investment interest qualifies for the §163(d) deduction.
- Not a substitute for estate planning — the SBLOC defers capital gains tax but does not eliminate estate tax on the portfolio. Estate planning structures (SLATs, dynasty trusts) are required to address the estate tax dimension.
Establish the SBLOC with your brokerage or bank
Most major custodians — Fidelity, Schwab, Morgan Stanley, Goldman Sachs, JP Morgan — offer SBLOC products. The line is established against a pledged portfolio and provides credit equal to 50–70% of portfolio value. Interest accrues only on the amount drawn, not on the full line. We advise on which positions to pledge and how to maintain adequate cushion.
Financial advisor or brokerage establishes — Shurek advises on tax implicationsModel borrow vs. sell before every liquidity decision
Before any significant draw on the SBLOC or any sale of appreciated securities, we run a specific comparison: what does selling cost in capital gains tax vs. what does borrowing cost in interest over the expected holding period? For most positions with significant unrealized gain, the break-even is reached within 1–3 years of interest payments. We calculate this for each specific decision.
Shurek — on-demand analysis for each liquidity decisionManage loan-to-value ratio to prevent margin calls
We recommend maintaining the SBLOC balance at no more than 30–40% of the portfolio's value, even when the lender would permit 60–70%. This cushion protects against a 40–50% market decline before any margin call is triggered. We review the loan-to-value ratio annually and advise on reducing the balance if portfolio declines erode the cushion.
Shurek in coordination with financial advisor — annual review| Form | Name | When Due | What It Does and Why It Matters |
|---|---|---|---|
| 1040 | Individual Income Tax Return | April 15 (extension to October 15) | The SBLOC itself creates no taxable event and nothing to report on your personal return — the loan proceeds are not income. If SBLOC proceeds are used to purchase investments and interest is being claimed as investment interest expense, Schedule B (interest income) and Form 4952 are relevant. Otherwise, the 1040 during the hold period reflects only the portfolio's dividends, interest, and any realized gains from other positions — not the unrealized gain in the pledged portfolio. |
| 4952 | Investment Interest Expense Deduction | Filed with Form 1040 when investment interest is claimed | If SBLOC proceeds are used to purchase other investments, the interest paid on the SBLOC may be deductible against investment income under §163(d). Form 4952 calculates the allowable deduction and carries forward any excess to future years. We evaluate whether this deduction is available each year based on how the SBLOC proceeds were used and the amount of investment income. |
Borrow vs. sell modeling for each specific liquidity decision. Investment interest expense deduction analysis and Form 4952 preparation. Annual cushion review and margin call risk assessment. Estate plan coordination — ensuring the SBLOC is structured consistently with the buy-borrow-die strategy and the overall estate plan. Advising on step-up in basis timing and estate liquidity at death.
Establishing and maintaining the SBLOC with the custodian. Portfolio management — selecting positions to pledge, maintaining diversification, managing the investment portfolio to support the loan. Monitoring loan-to-value ratios and advising on margin risk in real time.
The SBLOC requires no annual tax filings specific to the loan itself — but requires ongoing discipline in managing the loan-to-value ratio and coordinating borrow vs. sell decisions in real time.
Call Us Before Selling Any Appreciated Position
The single most important action in this strategy. Before selling any appreciated security, contact us. We will model the comparison in real time. One call can be worth tens of thousands of dollars.
Loan-to-Value Ratio Review
Review the outstanding SBLOC balance against current portfolio value. Confirm adequate cushion — we recommend outstanding balance at no more than 30-40% of portfolio value. Advise on paydown if cushion has eroded.
Investment Interest Expense Review
Determine whether interest paid on the SBLOC qualifies for the §163(d) investment interest deduction. Coordinate with year-end portfolio gain/loss harvesting decisions.
Form 4952 Filed if Investment Interest Claimed
If SBLOC interest qualifies as investment interest, Form 4952 is filed with the 1040 to claim the deduction and carry forward any excess.
Step-Up Applied — Estate Liquidity Coordinated
Outstanding SBLOC balance is an estate liability reducing the taxable estate. Assets receive step-up in basis. Estate must have sufficient liquid assets to repay the loan without forced sales. We coordinate estate liquidity planning annually.